Radon System Repair & Fan Replacement in Peoria, IL

The Manometer Reading Flat: Your First Warning Sign

The U-tube manometer installed near your vent pipe is designed to give you a simple visual check: when the fan is running and pulling suction, the liquid inside sits at an offset level, higher on one side than the other. When the fan stops working, that offset disappears and the liquid sits flat and level on both sides. This is usually the very first sign homeowners notice that something has gone wrong, and it is worth checking periodically, most people glance at it once a month or so once they know what to look for.

A flat manometer does not necessarily mean the fan itself has failed. It can also indicate a tripped breaker, an unplugged connection, or in rarer cases a completely blocked suction point or disconnected pipe joint somewhere in the run. Diagnosing which of these it actually is comes down to a straightforward check: confirming power at the fan first, since that rules out or confirms the simplest explanation before assuming the fan itself needs replacement.

Fan Lifespan and Why Replacement Is the Most Common Repair

Inline radon fans are rated for continuous outdoor-duty use, but like any motor that runs twenty four hours a day for years, they eventually wear out. Typical service life runs five to ten years, depending on the specific fan model, how it has been exposed to weather if it is mounted outside or in an unconditioned attic, and simply the luck of the draw with any mechanical component. Warning signs beyond a flat manometer include unusual grinding, humming, or rattling noises coming from the fan housing, noticeably increased noise compared to how the system originally sounded, or a fan that has simply stopped spinning.

Fan replacement is a contained job: the failed fan gets disconnected from the existing pipe, the new fan gets installed in the same location using the same mounting and electrical connection, and the system is tested to confirm suction is restored. Because the buried piping, suction point, and routing are already in place and do not need touching, fan replacement is one of the more affordable and fastest repairs a radon system typically needs, usually completed in a single visit.

• •Fans typically last five to ten years under continuous duty
• •Grinding, rattling, or unusual noise signals fan wear
• •Replacement reuses existing piping, mounting, and wiring
• •Most fan swaps completed in a single visit

Other Common Repairs: Cracked Joints and Sealing Failures

Beyond fan failure, the next most common repair issue is a cracked or disconnected PVC joint somewhere along the vent pipe run. This can happen from age, from a joint that was not fully solvent welded during original installation, from settling in the structure that stresses the pipe over years, or occasionally from accidental damage during unrelated renovation work in the house. A cracked joint reduces suction efficiency even if the fan itself is working fine, since it lets room air leak into the system instead of pulling soil gas from the suction point, and it can sometimes cause a retest to come back higher than expected even though the manometer looks normal.

Damaged suction points and sealing failures are less common but do happen, particularly if a homeowner has done foundation, plumbing, or crawlspace work in the years since the original system was installed without accounting for the mitigation system already in place. Sealing around penetrations, sump lids, and suction points can also degrade over a long enough timeline, especially in older installations that used less durable sealants than are standard practice today.

When a Rising Retest Number Points to a Repair Need

Since the EPA recommends retesting every two years after mitigation, a periodic retest is often what actually catches a repair need before a homeowner notices anything else wrong. A retest number that has crept up from what it read right after the original system was installed, even if it is still technically below 4.0 pCi/L, is worth investigating, since it can be an early sign of a fan losing efficiency, a developing joint leak, or a sealing failure at a suction point, well before the system fails outright.

If your retest came back meaningfully higher than your original post-install number, or at or above the action level again, the fix is almost never starting over with a new system design. It is diagnosing which specific component has degraded, repairing or replacing it, and confirming with another retest that the fix actually worked, the same discipline that goes into a brand new installation, just applied to a system that already has the hard infrastructure in place.

Frequently Asked Questions